SOUTH AFRICA'S anti-apartheid leader Allan Boesak and television producer Elna Botha, whose affair prompted him to resign his church ministry, were married on Saturday in a private ceremony in Cape Town . . . A SPRINGFIELD, MASS., man who set himself on fire in the second self-immolation in Massachusetts in one week remained hospitalized Saturday in critical condition, officials said. Authorities Saturday identified the man as Raymond Moules, 33.